Method, device, and system for regulating temperature of magnetron, variable-frequency power supply, and microwave apparatus

Abstract

A method for regulating a temperature of a magnetron includes: determining an anode current flowing through the magnetron and an output power of a variable-frequency power supply, the output power being configured to drive the magnetron to operate; calculating an anode voltage of the magnetron according to the anode current of the magnetron and the output power of the variable-frequency power supply; calculating an anode temperature of the magnetron according to the anode voltage of the magnetron; and regulating the output power of the variable-frequency power supply according to the anode temperature of the magnetron.

What is claimed is: 
     
       1. A method for regulating a temperature of a magnetron, comprising:
 determining an anode current flowing through the magnetron and an output power of a variable-frequency power supply, the output power being configured to drive the magnetron to operate; 
 calculating an anode voltage of the magnetron according to the anode current of the magnetron and the output power of the variable-frequency power supply; 
 calculating an anode temperature of the magnetron according to the anode voltage of the magnetron; 
 regulating the output power of the variable-frequency power supply according to the anode temperature of the magnetron to change the anode temperature of the magnetron. 
 
     
     
       2. The method according to  claim 1 , wherein determining the output power of the variable-frequency power supply comprises:
 acquiring an input power and an input voltage of the variable-frequency power supply; 
 calculating the output power of the variable-frequency power supply according to the input power of the variable-frequency power supply, and a corresponding relationship between the input power and the input voltage of the variable-frequency power supply and a power efficiency thereof. 
 
     
     
       3. The method according to  claim 1 , wherein regulating the output power of the variable-frequency power supply according to the anode temperature of the magnetron comprises:
 determining whether the anode temperature of the magnetron is greater than a predetermined temperature threshold; 
 lowering the output power of the variable-frequency power supply if the anode temperature of the magnetron is greater than the predetermined temperature threshold; 
 maintaining operation of the variable-frequency power supply if the anode temperature of the magnetron is less than the predetermined temperature threshold. 
 
     
     
       4. The method according to  claim 3 , wherein lowering the output power of the variable-frequency power supply comprises:
 determining the output power of the variable-frequency power supply; 
 determining whether the output power of the variable-frequency power supply is greater than a predetermined minimum power; 
 maintaining operation of the variable-frequency power supply if the output power of the variable-frequency power supply is greater than the predetermined minimum power; 
 stopping operation of the variable-frequency power supply if the output power of the variable-frequency power supply is less than the predetermined minimum power. 
 
     
     
       5. A controller, comprising:
 at least one processor; and 
 a memory communicably connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, wherein the instructions, when being executed by the at least one processor, cause the at least one processor to perform: 
 determining an anode current flowing through a magnetron and an output power of a variable-frequency power supply, the output power being configured to drive the magnetron to operate; 
 calculating an anode voltage of the magnetron according to the anode current of the magnetron and the output power of the variable-frequency power supply; 
 calculating an anode temperature of the magnetron according to the anode voltage of the magnetron; 
 regulating the output power of the variable-frequency power supply according to the anode temperature of the magnetron to change the anode temperature of the magnetron. 
 
     
     
       6. The controller according to  claim 5 , wherein the instructions, when being executed by the at least one processor, further cause the at least one processor to perform:
 acquiring an input power and an input voltage of the variable-frequency power supply; 
 calculating the output power of the variable-frequency power supply according to the input power of the variable-frequency power supply, and a corresponding relationship between the input power and the input voltage of the variable-frequency power supply and a power efficiency thereof. 
 
     
     
       7. The controller according to  claim 5 , wherein the instructions, when being executed by the at least one processor, further cause the at least one processor to perform:
 determining whether the anode temperature of the magnetron is greater than a predetermined temperature threshold; 
 lowering the output power of the variable-frequency power supply if the anode temperature of the magnetron is greater than the predetermined temperature threshold; 
 maintaining operation of the variable-frequency power supply if the anode temperature of the magnetron is less than the predetermined temperature threshold. 
 
     
     
       8. The controller according to  claim 7 , wherein the instructions, when being executed by the at least one processor, further cause the at least one processor to perform:
 determining the output power of the variable-frequency power supply; 
 determining whether the output power of the variable-frequency power supply is greater than a predetermined minimum power; 
 maintaining operation of the variable-frequency power supply if the output power of the variable-frequency power supply is greater than the predetermined minimum power; 
 stopping operation of the variable-frequency power supply if the output power of the variable-frequency power supply is less than the predetermined minimum power. 
 
     
     
       9. A microwave apparatus, comprising:
 a magnetron; 
 a variable-frequency power supply, comprising a variable-frequency circuit, wherein the variable-frequency circuit is configured to drive the magnetron; 
 a current sampling circuit, connected to a first node between the variable-frequency circuit and the magnetron, and configured to sample an anode current flowing through the magnetron; and 
 a controller, connected to the current sampling circuit and the variable-frequency power supply or the variable-frequency circuit respectively, wherein the controller comprises at least one processor; and 
 a memory communicably connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, wherein the instructions, when being executed by the at least one processor, cause the at least one processor to perform: 
 determining an anode current flowing through the magnetron and an output power of a variable-frequency power supply, the output power being configured to drive the magnetron to operate; 
 calculating an anode voltage of the magnetron according to the anode current of the magnetron and the output power of the variable-frequency power supply; 
 calculating an anode temperature of the magnetron according to the anode voltage of the magnetron; 
 regulating the output power of the variable-frequency power supply according to the anode temperature of the magnetron. 
 
     
     
       10. The microwave apparatus according to  claim 9 , wherein the instructions, when being executed by the at least one processor, further cause the at least one processor to perform:
 acquiring an input power and an input voltage of the variable-frequency power supply; 
 calculating the output power of the variable-frequency power supply according to the input power of the variable-frequency power supply, and a corresponding relationship between the input power and the input voltage of the variable-frequency power supply and a power efficiency thereof. 
 
     
     
       11. The microwave apparatus according to  claim 9 , wherein the instructions, when being executed by the at least one processor, further cause the at least one processor to perform:
 determining whether the anode temperature of the magnetron is greater than a predetermined temperature threshold; 
 lowering the output power of the variable-frequency power supply if the anode temperature of the magnetron is greater than the predetermined temperature threshold; 
 maintaining operation of the variable-frequency power supply if the anode temperature of the magnetron is less than the predetermined temperature threshold. 
 
     
     
       12. The microwave apparatus according to  claim 11 , wherein the instructions, when being executed by the at least one processor, further cause the at least one processor to perform:
 determining the output power of the variable-frequency power supply; 
 determining whether the output power of the variable-frequency power supply is greater than a predetermined minimum power; 
 maintaining operation of the variable-frequency power supply if the output power of the variable-frequency power supply is greater than the predetermined minimum power; 
 stopping operation of the variable-frequency power supply if the output power of the variable-frequency power supply is less than the predetermined minimum power. 
 
     
     
       13. The microwave apparatus according to  claim 9 , wherein the controller is arranged inside the variable-frequency power supply, the current sampling circuit comprises:
 a current transformer, coupled between the variable-frequency circuit and the magnetron, and configured to sample the anode current flowing through the magnetron; 
 a first signal conditioning circuit, connected to the current transformer, and configured to condition the anode current sampled by the current transformer. 
 
     
     
       14. The microwave apparatus according to  claim 9 , wherein the controller is arranged outside the variable-frequency power supply, the current sampling circuit comprises:
 a sampling resistor, connected in series between the variable-frequency power supply and the magnetron; 
 a second signal conditioning circuit, connected in parallel between two terminals of the sampling resistor, and configured to condition the anode current sampled by the sampling resistor. 
 
     
     
       15. The method according to  claim 1 , further comprising:
 acquiring a predetermined association table, the predetermined association table pre-storing a mapping relationship between the anode voltage of the magnetron and the output power of the variable-frequency power supply; 
 searching for the output power of the variable-frequency power supply corresponding to the anode voltage of the magnetron from the predetermined association table; 
 regulating the output power of the variable-frequency power supply to the output power that is searched out. 
 
     
     
       16. The controller according to  claim 5 , wherein the instructions, when being executed by the at least one processor, further cause the at least one processor to perform:
 acquiring a predetermined association table, the predetermined association table pre-storing a mapping relationship between the anode voltage of the magnetron and the output power of the variable-frequency power supply; 
 searching for the output power of the variable-frequency power supply corresponding to the anode voltage of the magnetron from the predetermined association table; 
 regulating the output power of the variable-frequency power supply to the output power that is searched out. 
 
     
     
       17. The microwave apparatus according to  claim 9 , wherein the instructions, when being executed by the at least one processor, further cause the at least one processor to perform:
 acquiring a predetermined association table, the predetermined association table pre-storing a mapping relationship between the anode voltage of the magnetron and the output power of the variable-frequency power supply; 
 searching for the output power of the variable-frequency power supply corresponding to the anode voltage of the magnetron from the predetermined association table; 
 regulating the output power of the variable-frequency power supply to the output power that is searched out.